Okla. Stat. tit. 12A, § 12A-8-204: Effect of Issuer's Restrictions on Transfer

Effect of Issuer's Restrictions on Transfer.

A restriction on transfer of a security imposed by the issuer,

even if otherwise lawful, is ineffective against a person without

knowledge of the restriction unless:

(1) the security is certificated and the restriction is

noted conspicuously on the security certificate; or

(2) the security is uncertificated and the registered

owner has been notified of the restriction.